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[Redux Migration Example] Step 3
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| // User useUserStore hook, and context creation | |
| import * as React from "react"; | |
| type User = { | |
| id: string; | |
| name: string; | |
| } | |
| type UserStore = { | |
| users: User[]; | |
| updateUser: (user: User) => void; | |
| deleteUser: (user: User) => void; | |
| } | |
| const INITIAL_USERS_STATE: UserStore = { | |
| users: []; | |
| deleteUser: () => { | |
| //Intentionally blank - set in UserStoreProvider below | |
| }; | |
| updateUser: () => { | |
| //Intentionally blank - set in UserStoreProvider below | |
| }; | |
| } | |
| const UserStoreContext = React.createContext<UserStore>(INITIAL_USERS_STATE) | |
| // Our provider, to include near the top of the application, so most components may access its state. | |
| export const UserStoreProvider: React.FC = ({ children }) => { | |
| const [users, setUsers] = React.useState([]); | |
| React.useEffect(() => { | |
| fetchUsersFromAPI().then((serverUsers: User[]) => { | |
| setUsers(users) | |
| }) | |
| }, [setUsers]); | |
| const updateUser = React.useCallback(async (user) => { | |
| // Perhaps you update the server: | |
| // await updateServerUser(user); | |
| setUsers( | |
| users.map((item) => { | |
| if (item.id === user.id) { | |
| return {...user}; | |
| } | |
| return item; | |
| }) | |
| ); | |
| }, [setUsers, users]); | |
| const deleteUser = React.useCallback(async (user) => { | |
| // Perhaps you update the server: | |
| // await deleteServerUser(user); | |
| setUsers( | |
| users.filter((item) => { | |
| return item.id !== user.id; | |
| }) | |
| ); | |
| }, [setUsers, users]); | |
| const userStore = React.useMemo(() => { | |
| return { deleteUser, updateUser, users } | |
| }, [deleteUser, updateUser, users]); | |
| return ( | |
| <UserStoreContext.Provider value={userStore}> | |
| {children} | |
| </UserStoreContext.Provider> | |
| ); | |
| } | |
| // Our hook, which just exposes the shared context to any components under 'UserStoreProvider' | |
| export const useUserStore = () => React.useContext(UserStoreContext) |
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| // UsersList without redux | |
| import * as React from "react"; | |
| import { useUserStore } from "app/hooks/user-hooks" | |
| // UserItem represents a user item in the list | |
| import UserItem from "app/components/UserItem"; | |
| const UsersList: React.FC = () => { | |
| const { users, updateUser, deleteUser } = useUserStore(); | |
| return users.map((user: User) => { | |
| return <UserItem key={user.id} onTapDelete={deleteUser} onUpdate={updateUser} />; | |
| }); | |
| } | |
| export default UsersList; |
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